There are two kinds of minds. One is an open mind, another is a closed mind. Closed mind is that which says, “This is how it is”, “I know it. That is it”. It gets hardened. An open mind is, “Oh, may be! Perhaps! I do not know!” Limited knowledge and conformity to it makes a mind very hard. Whenever you seem to understand a situation and label it – “This is how it is”, that is the beginning of your problem.